<template>
  <div class="goods">
    <div class="menu-wrapper" ref="menuWrapper">
      <ul>
        <li v-for="(item,index) in goods" class="menu-item" :class="{'current':currentIndex===index}" @click="selectMenu(index)">
          <span class="text border-1px">
            <span v-show="item.type>0" class="icon" :class="classMap[item.type]"></span>{{item.name}}
          </span>
        </li>
      </ul>
    </div>
    <div class="foods-wrapper" ref="foodsWrapper">
      <ul>
        <li v-for="item in goods" class="food-list food-list-hook">
          <h1 class="title">{{item.name}}</h1>
          <ul>
            <li v-for="food in item.foods" class="food-item border-1px">
              <div class="icon">
                <img width="57" height="57" :src="food.icon">
              </div>
              <div class="content">
                <h2 class="name">{{food.name}}</h2>
                <p class="desc">{{food.description}}</p>
                <div class="extra">
                  <span class="count">月售{{food.sellCount}}份</span><span>好评率{{food.rating}}%</span>
                </div>
                <div class="price">
                  <span class="now">￥{{food.price}}</span><span class="old" v-show="food.oldPrice">￥{{food.oldPrice}}</span>
                </div>
                <div class="cartcontrol-wrapper">
                  <cartcontrol :food="food"></cartcontrol>
                </div>
              </div>
            </li>
          </ul>
        </li>
      </ul>
    </div>
    <shopcart :select-foods="selectFoods" :delivery-price="seller.deliveryPrice" :min-price="seller.minPrice"></shopcart>
  </div>
</template>

<script type="text/ecmascript-6">
  import BScroll from 'better-scroll';
  import shopcart from '../../components/shopcart/shopcart';
  import cartcontrol from '../../components/cartcontrol/cartcontrol';
  const ERR_OK = 0;
  export default {
    props: {
      seller: {
        type: Object
      }
    },
    data () {
      return {
        goods: [],
        listHeight: [],
        scrollY: 0
      };
    },
    computed: {
      currentIndex() {
        for (let i = 0; i < this.listHeight.length; i++) {
          let height1 = this.listHeight[i];
          let height2 = this.listHeight[i + 1];
          if (!height2 || (this.scrollY >= height1 && this.scrollY < height2)) {
                return i;
          }
        }
        return 0;
      },
      selectFoods() {
        let foods = [];
        this.goods.forEach((good) => {
          good.foods.forEach((food) => {
            if (food.count) {
              foods.push(food);
            }
          });
        });
        return foods;
      }
    },
    created () {
      this.classMap = ['decrease', 'discount', 'special', 'invoice', 'guarantee'];
      this.$http.get('/api/goods').then((response) => {
        response = response.body;
        if (response.errno === ERR_OK) {
          this.goods = response.data;
          this.$nextTick(() => {
            this._initScroll();
            this._calculateHeight();
          });
        }
      });
    },
    methods: {
      selectMenu (index) {
        console.log(index);
        let foodList = this.$refs.foodsWrapper.getElementsByClassName('food-list-hook');
        let el = foodList[index];
        this.foodsScroll.scrollToElement(el, 300);
      },
      _initScroll() {
        this.menuScroll = new BScroll(this.$refs.menuWrapper, {
          click: true
        });

        this.foodsScroll = new BScroll(this.$refs.foodsWrapper, {
          click: true,
          probeType: 3// 传这个属性，是因为想让better-scroll滚动的时候，能实时告诉我们滚动的位置，相当于一个探针的效果
        });
        this.foodsScroll.on('scroll', (pos) => {
          this.scrollY = Math.abs(Math.round(pos.y)); // math.rand()转化为整数，math.abs()取正值
        });
      },
      _calculateHeight () {
        // 拿到每个li
         let foodList = this.$refs.foodsWrapper.getElementsByClassName('food-list-hook');
         let height = 0;
         this.listHeight.push(height);
         // 对每个空间的高度统计
        for (let i = 0; i < foodList.length; i++) {
           let item = foodList[i];
           height += item.clientHeight;
          this.listHeight.push(height);
         }
      }
    },
    components: {
      shopcart,
      cartcontrol
    },
    events: {
      'cart.add'(target) {

      }
    }
  };
</script>

<style lang="stylus" rel="stylesheet/stylus">
  @import "../../common/stylus/mixin.styl";
  .goods
    display: flex
    position: absolute
    top: 174px
    bottom: 46px
    width: 100%
    height: auto
    overflow: hidden
    .menu-wrapper
      flex: 0 0 80px
      width: 80px
      background: #f3f5f7
      .menu-item
        display: table
        height: 54px
        width: 56px
        padding: 0 12px
        line-height: 14px
        &.current
          position: relative
          z-index: 10
          margin-top: -1px
          background: #fff
          font-weight: 700
          .text
            border-none()
        .icon
          display: inline-block
          vertical-align: top
          width: 12px
          height: 12px
          margin-right: 2px
          background-size: 12px 12px
          background-repeat: no-repeat
          &.decrease
            bg-image('decrease_3')
          &.discount
            bg-image('discount_3')
          &.guarantee
            bg-image('guarantee_3')
          &.invoice
            bg-image('invoice_3')
          &.special
            bg-image('special_3')
        .text
          display: table-cell
          width: 56px
          vertical-align: middle
          border-1px(rgba(7,17,27,0.1))
          font-size: 12px
    .foods-wrapper
      flex: 1
      .food-list
        width: 100%
        height: auto
        /*font-size: 0*/
        .title
          line-height: 24px
          font-size: 12px
          padding-left: 12px
          color: rgba(147,153,159,1)
          border-left: 2px solid #d9dde1
          background: #f3f5f7
        .food-item
          display: flex
          margin:18px
          padding-bottom: 18px
          background: #fff
          border-1px(rgba(7,17,27,0.1))
          &:last-child
            border-none()
            margin-bottom: 0
          .icon
            flex: 0 0 57px
            margin-right: 10px
          .content
            flex: 1
            .name
              font-size: 14px
              color: rgba(7,17,27,1)
              line-height: 14px
              margin: 2px 0 8px 0
            .desc,.extra
              font-size: 10px
              color: rgb(147,153,159)
              line-height: 10px
            .desc{
              margin-bottom: 8px
              line-height:12px
            }
            .extra
              .count
                margin-right: 12px
            .price
              line-height: 24px
              font-weight: 700
              .now
                color: red
                margin-right: 8px
                font-size: 14px
              .old
                color: rgb(147,153,159)
                font-size: 10px


            .cartcontrol-wrapper
              position: absolute
              right: 0
              bottom: 12px
</style>
